GWD -2 Q30 一道GWD的逻辑题 选E 求解释

francessaa

Shipping Clerk:  The five specially ordered shipments sent out last week were sent out on Thursday.  Last week, all of the shipments that were sent out on Friday consisted entirely of building supplies, and the shipping department then closed for the weekend.  Four shipments were sent to Truax Construction last week, only three of which consisted of building supplies.
If the shipping clerk’s statements are true, which of the following must also be true?
At least one of the shipments sent to Truax Construction last week was specially ordered.
At least one of last week’s specially ordered shipments did not consist of building supplies.
At least one of the shipments sent to Truax Construction was not sent out on Thursday of last week.
At least one of the shipments that were sent out on Friday of last week was sent to Truax Construction.
At least one of the shipments sent to Truax Construction last week was sent out before Frida
下面的解释  但是我看不懂呢

因为从原文只知周五SHIPMENT的都包括building supplies，不知其他时间SHIPMENT是否包括building supplies，所以去TC的四个SHIPMENT不知何时送出（除知一个不是周五，因为没有building supplies），也有可能除周五外的其他时间，因为也可能其它时间SHIPMENT的有building supplies。因为不知何时送出，所以也不知至少有一个周四送出，何况周四送出也不一定是specially ordered（specially ordered都周四送出，不等于周四送出的都是specially ordered）。所以A和原文信息还差远，不可能是MUST BE。又因为不知其他时间的SHIPMENT是否有building supplies，所以B也错。至于A，B是否相当，我认为两者差别太大了，谈不上相当。 lawyer

applemay

为什么不可能到tx的船都是specially order的呢，题目没说specially order 的船装了什么呀

francessaa

多谢 明白了 关键有句话没看懂，， 原来周五至运 building shippier啊

kronorrt

集合类型题，看的有点头晕。。呵呵

基本结构是：
1、上周五天，周四运了4个special ordered，周五只运了building supplies
2、上周五天里，一共向Truax运了3个building supplies 和 1个其他货物

E 对，因为周五只运了building supplies，那么向Truax运的那个其他货物，必然是在周五之前运的。

其他选项不对，主要是因为special ordered，building supplies 和 向Truax运的 三个集合，都有可能存在交集。